GetUIElement:

--------------------------------------------------------------------------
   Get certain properties of UIElements.

   property   
   --------
   'visible'
   'position'
   'datastructure'

   If the handle is for a uicontrol it will return
   the property of that uicontrol.

--------------------------------------------------------------------------
   Form:
   x = GetUIElement( h, property )
--------------------------------------------------------------------------

   ------
   Inputs
   ------
   h          (:)    Handle
   property   (1,:)  Property
       
   -------
   Outputs
   -------
   x          {:}    Depends on the property

--------------------------------------------------------------------------

Children:

Common: General/Cell2DToStruct